Firefox Community Forum

Current Setup: OS: Windows 11 Home (10.0.26200) Firefox Version: 151.0.2 (Build ID: 20260525130955)

Issue:

• Firefox suddenly is unable to connect to any wesbite
• All attempts to browse result in the "Secure Connection Failed" screen
• All other browsers function fine with no network connectivity issues

Exact Display Text:

Secure Connection Failed

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. What can you do about it?

The issue is most likely with the website, and there is nothing you can do to resolve it. You can notify the website’s administrator about the problem.

Attempted Fixes / Things Confirmed:

• Everything mentioned in: Firefox can't load websites but other browsers can

• Relevant about:config values:

* * security.enterprise_roots.enabled -> True

• * security.ssl.enable_ocsp_must_staple -> True
• * security.ssl.enable_ocsp_stapling -> True
• * security.tls.version.max -> 4
• * security.tls.version.min -> 3

• System locale and timezone are correct
• DNS over HTTPS is set to OFF
• HTTPS-Only Mode is set to Don't enable HTTPS-Only Mode
• Restarting in Troubleshooting Mode
• Disabling the Anti-Virus (including the device Firewall)
• Disabling any VPNs or network proxies
• Clearing cache and browsing history
• Clearing certificates from the Certificate Manager in Settings
• Attempting connection with a newly created profile
• Clearing the cert9.db file for Firefox to reset certificate information
• Refreshing Firefox (resetting it completely)
• Uninstalling and reinstalling Firefox (after clearing all Mozilla related %appdata% folders)

Observations

• When trying to mess with the device timezone and see if changing it back to the correct one would "reset" something, after a few attempts of starting Firefox in the wrong timezone and then restarting it after changing to the correct one, for a single session, I was able to browse normally again. I closed Firefox to see if the problem was fixed but it went back to the "Secure Connection Failed" page. Was unable to reproduce the same behavior.

• Tried installing a portable version of Firefox (151.0.3) from Firefox Portable .

After installation, the first session works perfectly fine but after I close the session and restart Firefox, it gives the same "Secure Connection Failed" message.

• * Reinstalling the portable version in the folder, gives the error from the get-go, not even the initial post-installation session works but installing in a different folder works fine for the first session but all subsequent restarts (sessions) of the browser give the same error.

My mouse is setup so that the tilt wheel does Ctrl+Tab and Ctrl+Shift+Tab rather then whatever actions the tilt wheel would normally send, and that has worked fine for years, but now all of a sudden it is not working in Firefox, it's changing the zoom level instead which is not what I want. Firefox must be reading the mouse directly or something, because it shouldn't even be getting normal tilt wheel events.

I had a power outage occur recently and when i booted my computer again I found that somehow my Firefox account was disconnected. All of my bookmarks and history gone, but things like accounts and site preferences were kept. The problem is that firefox is not saving my history and bookmarks cannot be made. I have checked common causes for this problems, like not activating sync and turning off "remember history", settings which were set up correctly.

Hi Everyone,

I've been having this problem for a wee while when I'm browsing facebook (which works better in Chrome) the site on firefox and as well as messenger is really laggy and I'm wondering if there is a hidden setting that I should change to improve this?

I only have adblock addon installed and I cleaned out the history and browser cookies ect but the problem still remains.

Any ideas? Thanks Rob

Hello, I can't log in to Facebook, only through Firefox, and that's the problem. Edge and Chrome work fine. I've already deleted cookies and temporary files, and still nothing. This problem has been occurring for a while.

At some point recently, a 'Profiles tab has appeared in my menu bar. Presumably this arrived during an update. I don't want it, keep accidentally clicking on it instead of bookmarks & want it gone. How do I remove it?

When following a link from a news website I keep getting this message - Secure Connection Failed - The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. It loads on my iPhone and other browsers using the same link. What setting do I need to address to get this to stop?

Most times pmc.ncbi.nlm.nih.gov visited this message appears "Checking your browser before accessing pmc.ncbi.nlm.nih.gov ... Click here if you are not automatically redirected after 5 seconds."

reCAPTCHA images provided but selection of images does not resolve the access issue. Not a problem with Safari

My mac froze, force quit did not work, unplugged it, turned it back on, all bookmarks were gone and not able to add new ones. Would like to restore old bookmarks and add new ones.

the problem started 2 or 3 updates ago. I keep hoping the latest update will fix the problem. I can still access using Chrome. I've tried clearing cache and turning off ETP

I purchased mozilla vpn. It worked fine for months until a few days ago. Now I can't use the internet at all without turning it off. With the purchased version off I turned on the vpn in the firefox browser. This seems to work fine but it is only in used within the browser. The ;purchased browser is installed on my Iphone and my Mac laptop. Same problem with both. I also received an email a day or so after the trouble started saying my password for Mozilla had been changed. I did not aske for this change. Since my internet access was shut off I couldn't initiate a change of my own. It took me another day to figure out my problem was the browser. At that point I changed my Mozilla login password. I wpou;ld ;like top keep usiong the purchased version of the mozilla vpn on both my laptop and my iphone (13) because it looks more thoroughly at data going in and out of my devices.

Thanks for your help Steve Krebs

Mozilla has been bragging about the free built-in Firefox VPN for months now. I still don't see it. I'm on the latest release (151.0.3) but I don't see any way to access it. I know they've said it would be a phased rollout but it's been a long time coming already. Am I doing somethin wrong?